Sago Palm

How to care for Sago Palm

Light

Cycas revoluta thrives in bright indirect light or a few hours of direct sun each day when grown indoors. A south- or west-facing windowsill is ideal in the UK. Plants moved outdoors in summer benefit from gradually increased sun exposure to avoid scorch. In lower light, growth slows further and fronds may become etiolated and pale.

Watering

Water thoroughly when the top 3 to 5 cm of compost has dried out, then allow the pot to drain fully. Overwatering is the most common cause of death in this species; the thick, starchy trunk stores water and the plant is highly susceptible to root rot in wet conditions. Reduce watering considerably in autumn and winter when growth is minimal. Always avoid letting the plant sit in standing water.

Soil and potting

A very free-draining compost is essential. A mix of two parts coarse perlite or grit to one part loam-based compost (such as John Innes No. 2) works well, or a proprietary cactus and succulent compost can be used. Good drainage prevents the anaerobic conditions that promote root rot. The pH should be slightly acidic to neutral, around 6.0 to 7.0.

Feeding

Feed with a balanced, slow-release fertiliser or a diluted liquid feed at half strength once a month during the active growing season from April to September. A formula with a relatively higher micronutrient content, particularly manganese and magnesium, helps maintain deep green frond colour. Do not feed in autumn or winter when the plant is not actively growing.

Humidity and temperature

Cycas revoluta tolerates the relatively dry air typical of UK homes reasonably well, though it prefers moderate humidity of around 40 to 50 per cent. Temperatures between 18 and 26 degrees C are ideal, but the plant can cope with cooler conditions down to around 10 degrees C if kept dry. It cannot tolerate frost and should always be brought indoors before the first frost if placed outside in summer.

Repotting

Repot only when the roots are visibly congested or emerging from the drainage holes, which given the plant's very slow growth rate may be only every three to five years. Choose a pot only slightly larger than the previous one and ensure it has adequate drainage holes. Terracotta pots are particularly suitable as they allow the compost to dry more evenly. Handle the roots carefully as they are brittle.

Pruning

Remove individual fronds only once they have turned entirely yellow or brown, cutting cleanly at the base where the frond meets the trunk. Do not remove green or partially green fronds, as the plant reabsorbs nutrients from them before they die back fully. Never cut into the growing crown at the top of the trunk, as this will kill the plant. Pruning is purely cosmetic and maintenance-based.

Is Sago Palm toxic?

Common problems

How to propagate

Offsets (pups)

Cycas revoluta occasionally produces small offsets, called pups, around the base of the trunk. These can be carefully detached with a clean, sharp knife once they are at least 8 to 10 cm in diameter. Allow the cut surface to callous for a day or two before potting into a gritty, free-draining compost and keeping warm and barely moist until rooted, which can take several months.

Seed

Fresh seeds, which are produced only on mature female plants, can be sown once cleaned of their fleshy outer coat. Sow in a shallow tray of moist, gritty compost at around 27 to 30 degrees C. Germination is slow and may take three to nine months. This method requires patience and is rarely practical for home growers in the UK.

Where Sago Palm comes from

Native to southern Japan, Ryukyu Islands.

Story and origins

The genus name Cycas is derived from the Greek word 'kykas', itself thought to be a scribal error or adaptation of 'koikas', meaning palm, reflecting early observers' impression that the plant resembled a palm tree. The species epithet revoluta comes from the Latin 'revolutus', meaning rolled back, referring to the way the edges of the leaflets curl or revolve downward along their margins. The common name Sago Palm references the edible starchy pith historically extracted from the trunk, though true sago is more accurately associated with the palm Metroxylon sagu.

Cycas revoluta has been cultivated in Japan and China for centuries, where it holds considerable ornamental and cultural significance. In Japan it is known as sotetsu and is a traditional garden plant, particularly associated with formal gardens, samurai residences, and Buddhist temple grounds. European knowledge of the species expanded following contact with East Asia in the sixteenth and seventeenth centuries, and it was formally described by Carl Peter Thunberg in 1782. By the Victorian era it had become a fashionable conservatory and ornamental plant across Europe, admired for its exotic, prehistoric appearance. It remains one of the most widely cultivated cycads in the world today.

Varieties to know

Cycas revoluta 'Variegata'

A rare form with yellow or cream variegation on the fronds; extremely slow-growing and seldom available commercially.

Cycas revoluta (dwarf forms)

Various compact selections are marketed under informal names, prized for remaining smaller over many decades; no formally accepted cultivar names are widely recognised.

Fun facts

• Cycas revoluta is not a palm at all; it is a cycad, a group of plants that predates the dinosaurs and has changed remarkably little over 200 million years.
• Individual plants can live for over 1,000 years in their native habitat, and some specimens in Japanese temple gardens are estimated to be several hundred years old.
• Cycads are dioecious, meaning individual plants are either male or female; only female plants produce seeds, and pollination in the wild is often carried out by specific weevil species.
• The starchy pith of the trunk and seeds has historically been processed and consumed as a food source in Japan and other parts of Asia, but requires extensive preparation to remove the toxic cycasin compounds.
• Cycas revoluta produces a single flush of new fronds each year, all emerging simultaneously in a ring around the crown centre in a behaviour sometimes called a flush or a break.

Sago Palm FAQ